diff --git a/.scratch/v0.5/issues/05-compare-same-version-guard.md b/.scratch/v0.5/issues/05-compare-same-version-guard.md
index 4e7403a..d95e79e 100644
--- a/.scratch/v0.5/issues/05-compare-same-version-guard.md
+++ b/.scratch/v0.5/issues/05-compare-same-version-guard.md
@@ -4,10 +4,10 @@
 
 **Blocked by:** 04 — 运行记录场景版本。
 
-**Status:** ready-for-agent
+**Status:** done
 
-- [ ] 同场景不同版本的两次运行对比：API 400，detail 含双方版本号
-- [ ] 同场景同版本对比正常生成（含动态用例场景——同考纲即可比）
-- [ ] 报告生成层对跨版本对比抛出明确错误
-- [ ] 前端对比候选按同场景 + 同版本过滤；跨版本被拒时提示可读
-- [ ] 集成与单元测试覆盖拒绝与放行两侧（先例：现有对比报告测试）
+- [x] 同场景不同版本的两次运行对比：API 400，detail 含双方版本号
+- [x] 同场景同版本对比正常生成（含动态用例场景——同考纲即可比）
+- [x] 报告生成层对跨版本对比抛出明确错误
+- [x] 前端对比候选按同场景 + 同版本过滤；跨版本被拒时提示可读
+- [x] 集成与单元测试覆盖拒绝与放行两侧（先例：现有对比报告测试）
diff --git a/CONTEXT.md b/CONTEXT.md
index 3e98cd1..b57adab 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -41,7 +41,7 @@ _Avoid_: 测试点、题目
 _Avoid_: 差异报告
 
 **场景版本（Scenario Version）**:
-场景考纲的版本标识。仅考纲字段（用例集、模型绑定、LLM 配置）变更时递增；名称、描述、标签等元数据编辑不升版。（决策见 ADR-0001，尚未实现）
+场景考纲的版本标识。仅考纲字段（用例集、模型绑定、LLM 配置）变更时递增；名称、描述、标签等元数据编辑不升版。（决策见 ADR-0001）
 _Avoid_: 修订号
 
 **评测运行（Run / EvalRun）**:
diff --git a/backend/agenteval/evaluation/report.py b/backend/agenteval/evaluation/report.py
index 398cfed..ebab83e 100644
--- a/backend/agenteval/evaluation/report.py
+++ b/backend/agenteval/evaluation/report.py
@@ -199,6 +199,12 @@ def generate_compare_report(run_id_1: str, run_id_2: str, session=None) -> dict[
     # "changed" and the diff would be meaningless — reject early.
     if report_a.get("scenario_id") != report_b.get("scenario_id"):
         raise ValueError("compare report requires both runs to use the same scenario")
+    # 同场景还须同考纲版本才可比（ADR-0001）
+    if report_a.get("scenario_version") != report_b.get("scenario_version"):
+        raise ValueError(
+            "compare report requires the same scenario version "
+            f"(A: v{report_a.get('scenario_version')}, B: v{report_b.get('scenario_version')})"
+        )
 
     def _summary_delta(key: str) -> float:
         return report_b["summary"][key] - report_a["summary"][key]
diff --git a/backend/agenteval/web/routers/reports.py b/backend/agenteval/web/routers/reports.py
index ea09dac..8e1ae16 100644
--- a/backend/agenteval/web/routers/reports.py
+++ b/backend/agenteval/web/routers/reports.py
@@ -31,6 +31,12 @@ def get_compare_report(
         raise HTTPException(status_code=404, detail=f"run not found: {run2}")
     if run_a.scenario_id != run_b.scenario_id:
         raise HTTPException(status_code=400, detail="对比报告要求两个运行使用相同场景")
+    if run_a.scenario_version != run_b.scenario_version:
+        raise HTTPException(
+            status_code=400,
+            detail=f"对比报告要求相同的场景考纲版本（A: v{run_a.scenario_version}, B: v{run_b.scenario_version}），"
+                   "考纲变更前后的运行不可比",
+        )
     return generate_compare_report(run1, run2, session)
 
 
diff --git a/docs/adr/0001-scenario-versioning-for-comparability.md b/docs/adr/0001-scenario-versioning-for-comparability.md
index 0a528c6..41159b1 100644
--- a/docs/adr/0001-scenario-versioning-for-comparability.md
+++ b/docs/adr/0001-scenario-versioning-for-comparability.md
@@ -10,5 +10,5 @@
 
 ## Consequences
 
-- 数据模型需加 scenario version 字段，Run 需记录所用版本（v0.5 实施项，尚未实现）
+- 数据模型已加 scenario version 字段，Run 创建时快照所用版本（v0.5 已实现）
 - 动态用例每次运行题目不同不影响可比性——可比性单位是"同考纲"（同场景同版本），不是"同考卷"
diff --git a/frontend/web/src/pages/Reports.tsx b/frontend/web/src/pages/Reports.tsx
index 3adcc52..8c563e4 100644
--- a/frontend/web/src/pages/Reports.tsx
+++ b/frontend/web/src/pages/Reports.tsx
@@ -125,10 +125,11 @@ export default function ReportsPage() {
   const handleView = (runId: string) => {
     setSearchParams({ run: runId })
     loadReport(runId)
-    // 对比报告要求同场景：A 变更后若 B 场景不同则清空
+    // 对比报告要求同场景同版本：A 变更后若 B 不可比则清空
     const a = runs.find((r) => r.id === runId)
     const b = runs.find((r) => r.id === compareRunId)
-    if (a && b && a.scenario_id !== b.scenario_id) setCompareRunId('')
+    if (a && b && (a.scenario_id !== b.scenario_id
+      || (a.scenario_version ?? 1) !== (b.scenario_version ?? 1))) setCompareRunId('')
   }
 
   const handleCompare = async () => {
@@ -205,10 +206,14 @@ export default function ReportsPage() {
 
   const runSelectOptions = filteredRuns.map(buildOption)
 
-  // 报告 B 只能选与报告 A 同场景的 run
+  // 报告 B 只能选与报告 A 同场景同版本（同考纲）的 run
   const selectedRun = runs.find((r) => r.id === selectedRunId)
   const compareOptions = runs
-    .filter((r) => r.id !== selectedRunId && selectedRun && r.scenario_id === selectedRun.scenario_id)
+    .filter((r) =>
+      r.id !== selectedRunId
+      && selectedRun
+      && r.scenario_id === selectedRun.scenario_id
+      && (r.scenario_version ?? 1) === (selectedRun.scenario_version ?? 1))
     .map(buildOption)
 
   const optionFilter = (input: string, opt?: { searchText?: string }) =>
@@ -291,7 +296,7 @@ export default function ReportsPage() {
                   filterOption={optionFilter}
                   options={compareOptions}
                   popupMatchSelectWidth={false}
-                  notFoundContent={<Empty image={Empty.PRESENTED_IMAGE_SIMPLE} description="没有同场景的其他评测记录" />}
+                  notFoundContent={<Empty image={Empty.PRESENTED_IMAGE_SIMPLE} description="没有同场景同版本的其他评测记录" />}
                 />
               </Tooltip>
               <Button
diff --git a/tests/integration/test_reports_api.py b/tests/integration/test_reports_api.py
index d778e21..7d2dcab 100644
--- a/tests/integration/test_reports_api.py
+++ b/tests/integration/test_reports_api.py
@@ -39,7 +39,12 @@ def client_with_db(tmp_path):
     session.close()
 
 
-def _seed_run(session: Session, name_suffix: str = "", scenario_id: str | None = None) -> str:
+def _seed_run(
+    session: Session,
+    name_suffix: str = "",
+    scenario_id: str | None = None,
+    scenario_version: int = 1,
+) -> str:
     target = EvalTarget(
         name=f"target{name_suffix}",
         platform=PlatformType.AI_DIGITAL_EMPLOYEE,
@@ -60,6 +65,7 @@ def _seed_run(session: Session, name_suffix: str = "", scenario_id: str | None =
     run = EvalRun(
         target_id=target.id,
         scenario_id=scenario_id,
+        scenario_version=scenario_version,
         status=RunStatus.COMPLETED,
     )
     run = RunRepository(session).create(run)
@@ -165,6 +171,29 @@ def test_compare_report_different_scenarios_400(client_with_db):
     assert "相同场景" in resp.json()["detail"]
 
 
+def test_compare_report_cross_version_400(client_with_db):
+    """同场景不同考纲版本 → 400，提示含双方版本号（ticket 05 / ADR-0001）。"""
+    client, session = client_with_db
+    run_id_a = _seed_run(session, "A")
+    sid = RunRepository(session).get(run_id_a).scenario_id
+    run_id_b = _seed_run(session, "B", scenario_id=sid, scenario_version=2)
+    resp = client.get(f"/api/reports/compare?run1={run_id_a}&run2={run_id_b}")
+    assert resp.status_code == 400
+    detail = resp.json()["detail"]
+    assert "v1" in detail and "v2" in detail
+
+
+def test_compare_report_same_version_ok(client_with_db):
+    client, session = client_with_db
+    run_id_a = _seed_run(session, "A", scenario_version=3)
+    sid = RunRepository(session).get(run_id_a).scenario_id
+    run_id_b = _seed_run(session, "B", scenario_id=sid, scenario_version=3)
+    resp = client.get(f"/api/reports/compare?run1={run_id_a}&run2={run_id_b}")
+    assert resp.status_code == 200
+    assert resp.json()["run_a"]["scenario_version"] == 3
+    assert resp.json()["run_b"]["scenario_version"] == 3
+
+
 def test_compare_report_run_not_found(client_with_db):
     client, session = client_with_db
     run_id = _seed_run(session)
diff --git a/tests/unit/test_report.py b/tests/unit/test_report.py
index c9c4d05..011eebe 100644
--- a/tests/unit/test_report.py
+++ b/tests/unit/test_report.py
@@ -40,6 +40,7 @@ def _seed_run(
     pass_rate: float = 1.0,
     n_cases: int = 1,
     scenario_id: str | None = None,
+    scenario_version: int = 1,
     connectivity_cases: int = 0,
     errored_cases: int = 0,
 ) -> str:
@@ -72,6 +73,7 @@ def _seed_run(
     run = EvalRun(
         target_id=target.id,
         scenario_id=scenario_id,
+        scenario_version=scenario_version,
         status=RunStatus.COMPLETED,
     )
     run = RunRepository(session).create(run)
@@ -242,6 +244,24 @@ def test_compare_report_different_scenarios_rejected(report_session):
         generate_compare_report(run_id_a, run_id_b, report_session)
 
 
+def test_compare_report_cross_version_rejected(report_session):
+    """同场景不同考纲版本不可比（ticket 05 / ADR-0001）。"""
+    run_id_a = _seed_run(report_session, n_cases=1)
+    sid = _scenario_of(report_session, run_id_a)
+    run_id_b = _seed_run(report_session, n_cases=1, scenario_id=sid, scenario_version=2)
+    with pytest.raises(ValueError, match="version"):
+        generate_compare_report(run_id_a, run_id_b, report_session)
+
+
+def test_compare_report_same_version_allowed(report_session):
+    run_id_a = _seed_run(report_session, n_cases=1, scenario_version=2)
+    sid = _scenario_of(report_session, run_id_a)
+    run_id_b = _seed_run(report_session, n_cases=1, scenario_id=sid, scenario_version=2)
+    result = generate_compare_report(run_id_a, run_id_b, report_session)
+    assert result["run_a"]["scenario_version"] == 2
+    assert result["run_b"]["scenario_version"] == 2
+
+
 # ── connectivity case annotation (ticket 02) ─────────────────────────────
 
 def test_report_marks_connectivity_case(report_session):